function checkInput()
               {
					
//kiem tra user name
                        if (document.forms[0].username.value==''||document.forms[0].email.value=='')
                         {
                                alert('Username and Email do not match');
                                document.form.myform.username.focus();
                                return false;
                         }
//kiem tra password
                      
                    return true;
               }


